Walking and walking for even an hour every week, 10 minutes a day, may help prolong their lives, according to a new study by South Korean scientists from Seoul's Sangye Paik Hospital at Inje University. They found that people 80 and older who walked at least an hour a week had up to 40% lower relative risk of all-cause mortality and cardiovascular disease compared with inactive people. And walking was associated with life extension in older adults regardless of whether they engaged in moderate- or high-intensity physical activity. It is recommended that adults, regardless of their age, engage in at least 150 minutes per week of moderate-intensity physical activity or 75 minutes per week of vigorous-intensity physical activity, or an equivalent combination. However, with age, sedentary time tends to increase as physical activity decreases. Separately, the National Cancer Institute study suggests the benefits of walking and other physical activity for people somewhat younger than age 59 to 82. The NCI study, the results of which were published in the journal JAMA Network Open, said older people who walk or engage in other physical activities, such as jogging, swimming laps or playing tennis, may have a lower risk of dying from any cause, including cardiovascular disease and cancer. Doing the recommended amount of weekly physical activity in any combination of these activities was associated with a 13 percent lower risk of death from any cause compared with no activity, the researchers said. While racquet sports were associated with the greatest reduction in risk of death from cardiovascular disease, by 27%, running was associated with the greatest reduction in risk of death from cancer, by 19%.